M8: custom detents for ScarfGo sheets (permission, cron editor)

.medium is neither/nor — too tall to peek, too short to commit to.
Research recommends custom detents calibrated per sheet.

- Permission sheet: `[.height(220), .large]`. 220pt shows the prompt
  + first ~3 options without forcing the user to drag; `large` is
  there for edge-case prompts with many options.
- Cron editor: `[.large]` only. Cron editing is a focused task with
  a ~6-field form; peek detent is a distraction.

`.presentationDragIndicator(.visible)` on both so users know they
can drag the sheet without having to try + fail first.

No other sheets in the app today. The Forget-server confirmation
uses confirmationDialog (system-owned — no detents needed).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scarf/Scarf iOS/Chat/ChatView.swift

@@ -78,6 +78,12 @@ struct ChatView: View {
                     optionId: optionId
                 )
             }
+            // Custom detents — `.medium` is either too tall (empty
+            // space above) or too short (options clipped). A 220pt
+            // peek shows the prompt + first ~3 options; users can
+            // drag to large for long option lists.
+            .presentationDetents([.height(220), .large])
+            .presentationDragIndicator(.visible)
         }
     }
 

scarf/Scarf iOS/Cron/CronListView.swift

@@ -87,11 +87,18 @@ struct CronListView: View {
             CronEditorView(initial: job, title: "Edit cron job") { edited in
                 Task { await vm.upsert(edited) }
             }
+            // Cron editor is a Form with ~6 fields; .large gives room
+            // without cramping. No peek detent — editing cron jobs is
+            // a focused task, not something users want to half-see.
+            .presentationDetents([.large])
+            .presentationDragIndicator(.visible)
         }
         .sheet(isPresented: $showingNewJob) {
             CronEditorView(initial: nil, title: "New cron job") { created in
                 Task { await vm.upsert(created) }
             }
+            .presentationDetents([.large])
+            .presentationDragIndicator(.visible)
         }
     }
 }